A)根据句意及汉语提示，写出所缺单词。

1. We don’t often __________ (亲吻) our friends in China.

2. Jim didn’t know the __________ (主题) about the report.

3. People can’t smoke in __________ (公共的) places.

4. The doctor gave him some medicine to reduce his __________ (疼痛).

5. Jack always __________ (解释) difficult Maths problems carefully to his students.

B)根据句意，用括号内所给单词的适当形式填空。

6. I think leaving the tap __________ (run) is a big waste.

7. It is rude __________ (push) in before others when waiting for the bus.

8. If you want to be a __________ (success) writer, you should read and write more.

9. Listen! They are reading English _________(loud).

10. It is __________ (polite) to be so rude to your parents.

11. My father warned us not __________ (play) football in the street.

12. Let’s have a __________ (discuss) on this school trip plan.

13. Look at the sign. It says “No __________ (park)”.

14. They were willing to risk __________ (lose) their jobs. 

15. I don’t know the proper way __________ (greet) Americans.